When operating under severe budget constraints a CISO will have to be creative to maintain...

 Explanation:

Open source security tools, when obtained from trusted sources and thoroughly tested, can provide cost-effective solutions without compromising the security of the production environment.

Testing ensures that the tools function correctly and do not introduce vulnerabilities or operational risks.

 Why Other Options Are Incorrect:

A. Deploy open source tools directly: Deploying without testing risks introducing vulnerabilities or performance issues.

B. Use trial versions of commercial tools: Trial versions often have limitations and may violate licensing agreements.

D. Download tools and deploy directly: This approach skips essential testing and evaluation, which is critical for maintaining security.

 EC-Council CISO Reference:The program highlights the importance of validating and testing any tools or software before deployment to prevent unintended risks to the production environment.